Receiving apparatus for high frequency signaling systems



Jan. 6, 1931. N. P. HINTON RECEIVING APPARATUS FOR HIGH FREQUENCY SIGNALING SYSTEMS Filed Aug. 28, 1925 2 Sheets-Sheet l IL 27 ll FE T WITNESSES 'INVENTOR Norman H/I/en Hin/an. LU a/m/ ATTORNEY a/mgma I Patented Jan. 6,1931

nomnrnmnn nrn'ronor TI PE LEY; imam; nssienon 'ro assoom'rnn q I raicA-n nnnsrarns mmrnn, AUBRITISTH oonrnmr l v niicnrvrne nrraaarus on Bren rnnounncy srnatrne systems ":1 p n flbnfmd Augut 2 1925, Serial No. 53,076, and in Great Britain September11,1924.

- This invention-rlates to receiving apparatus forhigh frequencysignaling systems such as wireless telephony and 'telegraphy and'is also applicable to so-called wired 5 wire1ess-systems. The invention relates par-' connected through a variable tuning condenser 11 to the innermost turn of a flat spiral ticularly to the arrangement and constitution .of high frequency inductance coils of receiving apparatusin: which high. frequency and retroa'ctive'yalve; amplication' are employed.

' The object ofvthe' inventionis to provide an arrangement of'the high freopurency coils by which-efli'cient reception can be obtainedover any desired bands of 'wave lengths, by which tuning is easy to eifect,-and in which the extent ofretroaction and the tendency of the receiv'erto self-oscillation can be readily controlled even by un'skilledpersons. 7 i

.' According to this invention 1111a receiving system for high frequency electric signals zo which comprises aiplurality of inductance coils one'of said inductance coils is movably mounted so that its couplingwith'two or more'of the other inductance coils maybe varied at will Preferably the coils are so arranged that the mutual inductancebetween V the moving coil and-the other coils may be .varied between a maximum positive value and a negative value. 1 v i q The invention also comprises a unitfor a receiving system' coinprising three or more coils of which two are disposed in substantially the same plane or" parallel {adjacent planes-and a third is mounted to'move in a plane adjacent and parallel tothefirst men- 735 tione'd plane or planes.

To enable the inventlon to be more clearly understood one form .of wireless receiver employing the invention'and an inductance unit constructed according to the invention will now befdescribed with reference'to' the accompanying drawings in which Fig. 1 is a diagrammatic representation of a complete two-valve wireless receiver in whichithe first fvalve operates both as a high frequency and ;:1";il45 as a low frequency amplifier and Fig. 2 is a 7 front elevation, partlydiagrammatic, of

inductanceunit and Fig. 3; is a section on the line I IIIII of Fig. .2 looking in the directionof-the arrows. I i 1 Referring firstly to Fig.1 the aerial 10 is inductance-12. The outer end of the inductance 12 is connected to an earth terminal 13.

mionic valve 16.. (The-grid of the valve 16 is connectedv to the negative-end of its cathode through a usual grid leak resistance 32.

The-anodeofithe valve 16 isconnecteddirectly to the outermost convolution of a flat spiral inductance'l'Z The innermost convolution of the inductance 17 is connected through the telephones18,:which are shunted by a condenser'19',t0 the positive terminal of the high tension battery 20.; A flat spiral inductance 21 is disposed coaxial and parallel with the inductance 17 so that it is electromagnetically coupled thereto. The coupling oftheinductance121 to the inductance 17 may befixed or -.-variableas desiredbut is preferably fixed.

The inductance l 21- is shunted by. a variable condenser 22 and its outermost convolution is connectedthrough a gridcondenser 23 to the grid of a second valve 24 and the innermost convolution is connected to the cathode ofthevalve 24; The grid of the valve 24- is f connected to the cathode by a leak resistance 33 so that the valve 24 will function as a detector. I p :':The anode oftthe valve 24 isconnected to theinner end of an inductance 25 which constitutes a reaction coil. The outer end ofthe reaction coil 25 is connected through a high resistance 26 to thepositive terminal :of high tension battery 20 and through the block condenser of high .capacity 27 and high frequency choke coil 28 to the grid of the valve 116 whereby to pass back audio-frequency variations of potential from the anode of the valve 24 to the grid of the valve 16. The resistance 26 three circular recesses 41,:42. al-lderlfi: tr mme direction vof the arrow 51. lThe actual dispp sition of the coils 12, 17, 21 and 25 will bemo're re y errreeietedwith-seieieeeet :Eiss- -.1 and 2. A block of vebonite or the like 40 has in it which accommodate respectively the o aerial tuning ceil .theanodeginductance;17,

the s n ry nd t p i2law ieh sceup ed tothe anodeind'uctaneeli' 5' V 1 A p v 44 i P vid d ea t pper ed of'the bloek-offi ebonite-40. AnarmEGcaBrying at its loyverenda box47 andat its upper end a handle, notshownfisgiaounted up'orrthe pivot. The reaetion eoilffifi-i s disposed inithe u'ri'll *heseep that w;1m ;the I. coils ate wound and connected-as-idescr rbed W-ltl'LJZGfo erericetofEig.*l'andiarq mounted in the geo- I metrical relationship described -wi th reten 'QIiQB to;-Fig.- 12 -the; couplin'g between the coils 12,17 and '21 is'suchfas to tend-topppose -regeneration, thereby stabilizingtheset; When the reaction coil'i is'in itsigrpid-;positionp, as

,shown in Fgi g. --2, its coupling witlrthe aerial tuning coil'12 andtheandde andsecondary coils 1? ,arid21 is 'in such afkil-iigecti'ori in each "case n s te ten'd'to oppose regeneration, thus further assisting "the stabilization of "the set, EWheni howeverflthe reaction coil 25 is displaced'frornits mid positiontowards the coils lfi'fllld 1. e t n is app ie ts 31 5 9" oadva r fl eby usi ar s a e tw m th e circuit associated with theyalve and th ,r n agrimum reaction occurs when thefaxesof tl e,coi-ls 25 'and21 are coincident." Wtienthe 50 coil-25 is displaced from its *mid position toyvaijds fthe 'coil 1-2 "reaction is vintroduced group lib o th valyes'lfiand=24causinggrfegeneration inth e circuits of'these valves. Si nce-reaction around ftwo a'lv es is} more-sensitive than'reaction around one-valve the 'aer-ial coil lZis placed on theside of-the'blqck ofeben-ite '40 remotefrom'the reaction coil=25 so-that the maggi mum coupling between thegreaction coil andfthe; ae'rial tuning coil? 12/is somewhat "less; than that-between ithe reaction coil25 -of .the secondaryfQl.

It willbe'appreciatedthat the above 'descriptionis given byway of example o'nlyaud many modifications maybe maid withoutde-- partirug;from the scope of this invention.

cuit comprising an inductor coupled to sard I claim as my invention v 1. In a radio receiving system, two vacuum tubes, each having an input circuit and an output circuit, a coil in the output circuit of one tube, coils,rone in the input circuit of each tube, each having a fixed couplingoto the first-mentioned coil, said coupling being in the sense to tend to prevent regeneration and acoil' in the output circuit of the other tube'having an adjustable coupling to each e sai ai ru c ils fIn-araJdio receiving system, two vacuum tubes-each havingan input clrcuit and an nu nu circuita rlis lsci in heszutputn r Qu t Qf, onetuha'fitkicqils, One/in the/"input circuit of each tube, eachhaving a fixed coupling being in the sense to tend to prevent :reecnera-tien,saidmutnutce lheiugrcap e with one of said input coils and coaxial with the other, and adisk coil movable in a; plane parallel :to said "coplanar coils land =.on the opposite side of said coaxialcoihtherefrom, said movable coil beinggi-n the other :output circuit and coupled -tosa-id :input :eoils asense to'cause regeneration.

-3. In a'radio receiving system, a ugeuum tube having' an input cincuitiincllrdipg amin- 'ductor, -an output circuit: for said tube, the

' latter circuit serially j including ani inducter andgan indieating' device, a second gaouum tube having an input circuit ineluding an inductorcoupledgto the inductor in the output circuit ofthe first tube,-and an outputcireuit includinga resistor and an iinducton-the input inductors-of the saidtubes and theoutput inductor of the: first tube; being-so-wound and so mutually-coupledesto oppgseregem eration in the system, means for variably coupling the outputinductorofi the second tube to the said input circuit indpetors to control regeneration in the system,- ar rd-means whereby potential variations at =audio fr'equency acrosssaid resistor mayhe impressed on the input circuit of the first tube.

4:. -'In a radio receivingsystem ofthe reflex type. a thermionic device' having aninput circuit and an outputcireuit comprising an inductor nd an indicating'devi'ce,asecond thermionic devicehaving an input-cirfirst mentioned outp'ut'inductor and: an eptbut circuit ncluding a res1st0r,-mea ns where- 'by said second thermionic device functions as a detector. and a connection yvhereby poctential variations at au'dio {frequencies across said, res stor may beimpressed on' the 'input circuit of the first tube for amplification therein. whereby the tendency toward regeneration at audiofrequenc'ie's is-rni nimi'zed.

5. In a radio receiving system, a pai-ref vacuunr tubes havlng lnput and output -eircults. said input c rcuits including inductors loosely coupled electromagnetically to each other, an inductance coil each of said out- 7 scribed my namethis tenth day o f August, I I

put circuits,'one Of said inductance coils heva fixed coupling to said input inductors, and means whereby the other of said inductance coils may be variably coupled to the other coils for, controllingregeneration in said system; k f 7 Intestimony whereof I have hereunto sub 1925. k n NORMAN 1-?ULLI331IHINTQN. 

